公开(公告)号：WO1996008197A1

公开(公告)日：1996-03-21

申请号：PCT/US1995011051

申请日：1995-09-12

Applicant: ALAMED CORPORATION

Inventor： ALAMED CORPORATION ,  STERN, Roger, A. ,  RAWSON, Eric, G. ,  BENNETT, Michael ,  FERRIS, Jonathan, R. ,  GIESE, Charles, F.

IPC: A61B05/0205

CPC classification number: A61B5/7207 ,  A61B5/0205 ,  A61B5/1102 ,  A61B5/113 ,  A61B2562/0266 ,  G01P13/00 ,  G01P13/0086 ,  G01P15/093

Abstract: A fiber optic motion monitor includes a light source (21) and an optical fiber waveguide (22) with a sensing section (4) intermediate an input end and an output end. A motion transmitting device (3) is coupled to the sensing section of the optical fiber waveguide for transmitting motion of a patient to the sensing section. A photodetector (23) is positioned to receive a speckle pattern of light which changes in response to movement of the patient and sensing section. The sensing section (4) of the optical fiber waveguide includes a plurality of loops which are positioned between a relatively flexible plate (2) and a resistance member (3) such that the loops will change shape upon movement of the patient due to the patient's breathing and/or heartbeat. Also disclosed is a technique for identifying portions of a modal noise signal that are contaminated by body movement noise and then disregarding these contaminated portions during further processing.

Abstract translation: 光纤运动监视器包括具有在输入端和输出端之间的感测部分（4）的光源（21）和光纤波导（22）。 运动发送装置（3）耦合到光纤波导的感测部分，用于将患者的运动传递到感测部分。 光电检测器（23）被定位成接收响应于患者和感测部分的运动而变化的斑点图案。 光纤波导的感测部分（4）包括多个环，其位于相对柔性的板（2）和阻力构件（3）之间，使得环路在病人移动时由于患者的移动而改变形状 呼吸和/或心跳。 还公开了一种用于识别由身体运动噪声污染然后在进一步处理期间忽略这些污染部分的模态噪声信号的部分的技术。

公开(公告)号：WO1994025975A1

公开(公告)日：1994-11-10

申请号：PCT/US1994004064

申请日：1994-04-21

Applicant: ALAMED CORPORATION

Inventor： ALAMED CORPORATION ,  RAWSON, Eric, G.

IPC: H01J05/16

CPC classification number: A61B5/6892 ,  A61B5/1126 ,  A61B5/113 ,  A61B5/7415 ,  G01P13/00

Abstract: A motion monitor which produces audible sound representative of motions of a subject or object being monitored, including a carrier (21), an optical fiber (18) carried by the carrier, a laser source (14) for injecting a laser beam in the optical fiber to produce a speckle light pattern at the output of the optical fiber, a photodetector (16) for producing an output signal representative of modal noise developed in the optical fiber due to physical movement of the fiber, an amplifier (42) for amplifying the output of the photodetector, and a loudspeaker (46) which converts the amplified signals to audible sound representative of the modal noise at the fiber output. Optionally, the signals produced by the photodetector are shifted to a higher frequency range, e.g., the 500-700 Hz range, thereby to enable use of conventional inexpensive electronics and efficient loudspeakers. In one embodiment involving monitoring of a person, the frequency shifted output of the photodetector is transmitted to a remote location for remote monitoring of movements of the person. In another embodiment, the loudspeaker is mounted on the carrier and produces sound mimicking movement of the subject or object to which the carrier is attached.

Abstract translation: 一种运动监视器，其产生表示被监视对象或物体的运动的声音，包括载体（21），由所述载体承载的光纤（18），激光源（14），用于将激光束注入所述光学 光纤在光纤的输出端产生斑点光图案，用于产生表示由于光纤的物理移动而在光纤中产生的模态噪声的输出信号的光电检测器（16），用于放大光纤的放大器 光电检测器的输出和扬声器（46），其将放大的信号转换成表示光纤输出端的模态噪声的声音。 可选地，由光电检测器产生的信号被移动到更高的频率范围，例如500-700Hz的范围，从而能够使用传统廉价的电子设备和有效的扬声器。 在涉及对人的监视的一个实施例中，光电检测器的频移输出被发送到远程位置，用于远程监视人的移动。 在另一个实施例中，扬声器安装在载体上并产生模仿运动员所附着的被摄体或物体的声音。

公开(公告)号：WO1993011553A1

公开(公告)日：1993-06-10

申请号：PCT/US1992010334

申请日：1992-12-04

Applicant: ALAMED CORPORATION

Inventor： ALAMED CORPORATION ,  NAFARRATE, Antonio, B. ,  RAWSON, Eric, G.

IPC: H01J40/14

CPC classification number: A61B5/6892 ,  A61B5/02444 ,  A61B5/113 ,  A61B5/7239 ,  G01P13/00 ,  Y10S128/925

Abstract: A fiber optic body motion monitor in which light (1) is transmitted through an optical fiber waveguide physically coupled to a body being monitored, and modal noise at the output of the optical fiber waveguide (2) is applied to a photodetector (5), filtered, rectified and analyzed to detect breathing and heartbeats. Detection of breathing is performed by low-pass filtering the rectified and filtered signal, and adaptive thresholding of the low-pass filtered signal. A similar but separate technique is used to detect heartbeats. In one embodiment, reliability of detection is enhanced by reducing the number of speckles of light applied to the photodetector to approximately 50 %, thereby to maximize modal noise current. In another embodiment the photodetector (5) has two halves separately illuminated by approximately two-thirds of the light from the optical fiber waveguide (2). Outputs of the photodetector (5) halves are applied to the positive and negative inputs of an operational amplifier (61), whereby common mode noise is eliminated and modal noise current and therefore sensitivity of modal noise detection increased.